Self cooling filter cigarette



March 25', 1958 I H. -NlEDERMAN 2,827,903

SELF COOLING FILTER CIGARETTE Fi led Feb. 15., 1956 'INVENTOR.

WNW

United States Patent This invention relates to an improved cigarette, and one of its objects is to provide a cigarette with means for cooling the smoke as it is drawn into the mouth of the smoker and while so drawn subjecting the cooled smoke to a filtering action before it enters the mouth of the smoker.

Filtering of the smoke caused by the burning of cigarette tobacco as now commonly used involves the flow of the hot tobacco smoke through the filtering medium to the mouth of the smoker, and due to the heated condition of the undesirable parts of the tobacco smoke complete filtering is not obtained, and the tobacco smoke in a heated condition enters the mouth of the smoker and carries with it particles of tar and other objectionable ingredients, which irritate the mouth and throat of the smoker and thereby discourage smoking. Moreover the pleasure of smoking is modified by the flow of hot smoke into the mouthof the smoker.

I have discovered that by cooling the tobacco smoke in advance of filtration, that more complete filtering is obtained and that the tobacco smoke will enter the mouth of the smoker in a cooler condition and in a purer state, and that the pleasure derived from smoking will be improved.

My invention is carried out by providing the mouth end of the cigarette with a metal foil radiating device, which includes a series of small smoke passages, so that the heat of the smoke of the burning cigarette will be transferred to the metal foil, which is preferably of aluminum, thereby reducing the temperature of the tobacco smoke before it enters the filtering unit, with the result that some of the objectionable ingredients of the tobacco smoke are deposited in the numerous smoke passages and a cleaner tobacco smoke enters the filter at lower temperature.

Another object of the invention is to provide a smoke cooling unit which consists of a series of heat exchanger tubes of thin aluminum or other heat radiating material, and a smoke filtering unit located at the outer ends of these tubes, in the tip end of the cigarette, so that continuous cooling will take place in advance of the filtering of the smoke and a cool tobacco smoke in a cleaner state will be supplied the smoker.

A still further object of the invention is the provision of a cigarette with a heat radiating unit constructed of aluminum or metal foil provided with smoke tubes formed by metal strips transversely corrugated to form the smoke tubes or passages and wound on each other against plain metal foil strips, so that a low cost unit may be provided and numerous smoke passages thereby created through the heat exchanger.

With the above and other objects in view the invention comprises certain new and useful constructions, combinations and arrangements of parts, clearly described in the following specification, and shown in the drawings, in which:

Fig. 1 is a side view of the cigarette in full size.

Fig. 2 is a longitudinal sectional view thereof, enlarged to approximate double size.

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v Fig. 3 is a cross sectional view taken on line 3--3 of Fig. 2, looking in the direction of the arrows.

Fig. 4 is a cross sectional view of a modified form.

Fig. 5 is a cross sectional view of another modified form.

Fig. 6 is an enlarged edge view of a helical strip comprising two foil strips shaped to provide smoke passages.

Fig. 7 is a detail view showing the two foil strips separated in advance of the bonding together of these ships to establish the smoke passages across the bonded strips.

Fig. 8 is a cross sectional view showing another form of the heat exchanger or smoke cooler.

Referring to the accompanying drawings, which illustrate the practical embodiment of my invention, 10 designates the combustible wrapper or paper tube of the cigarette and 11 the supply of tobacco enclosed by this paper tube or wrapper, and which is in the conventional form of a cylindrical plug, of any wanted density 01' packing.

The mouth portion of the cigarette is provided with a heat radiating unit 12 and a filtering unit 13, located outwardly of the heat radiating or smoke cooling unit 12, while the smoke cooling unit may be placed directly against the cylindrical plug of tobacco. The paper wrapper 10 encloses both smoke cooilng unit and the filter, so that the cigarette when viewed from the outside before being smoked has a conventional appearance.

The heat exchanger or radiating unit 12 is constructed of a plurality of cylindrical tubes 12a, each providing a continuous longitudinal smoke passage 12b through the same, the opposite ends of each tube being open. These tubes are grouped in parallel relation to each other, with all of their ends disposed in a common transverse plane at each'end of the cooling orheat radiating unit.

These cooling tubes may be arranged in a single circle close to the wall of the paper wrapper, as shownin Fig. 4, and the core of this circle may be closed by a plug of tobacco, and a perforated disc 14 disposed at the inner end of this core plug of tobacco, so that the smoke from the burning cigarette would be diverted through the smoke passages of this group of tubes, close to the paper Wrapper, and the heat of the hot smoke thus dissipated to the atmosphere.

The heat exchanger tubes may also be arranged in an outer circular group, a central core group, and an in termediate group, as shown in Fig. 5 in cross section.

The individual aluminum or metal tubes are made of very thin stock, and may be produced by extrusion or by rolling, or by any method available. They may also be produced by forming two foil strips or sheets 15 and 16 with transverse grooves or smoke channels, as shown in Figs. 6 and 7, and in assembling two similar sheets or foil strips together and bonding these assembled sheets or strips so that the transverse grooves or smoke channels 15a and 16a will mate with each other. The bonding may be completed by crimping the foil strips between the mated smoke grooves, or by any other bonding means. When thus bonded or united the two strips provide a series of connected parallel smoke tubes or passages, and by winding this composite tube forming strip on itself, to provide a series of helical turns, the completed heat radiating or smoke cooling unit may be built up. In this way simple mechanism may be used for making the exchanger tubes and for forming the cooling unit.

In Fig. 8 I show a smoke cooler unit made up of a series of transversely corrugated rings 17, 13 and 19, and a series of intermediate uncorrugated rings 2i), 21, and 22, arranged alternately between the corrugated rings.

In all cases the smoke is forced to flow through the heat exchanger tubes or smoke passages, and the hot tobacco smoke is thus cooled considerably by the exchange of heat through the cooling unit to the atmosphere. After the cooled smoke leaves the heat exchanger unit it is forced to flow through the fibrous filter of the complete cigarette, and when it enters the mouth of the smoker the tobacco 1 smoke has been cooled considerably and due to this cooling more of the objectionable ingredients of the tobacco smoke are deposited in the filtering medium The cooler the tobacco smoke the more of these ingredients are separated from the smoke stream and deposited either in the smoke passages of the heat exchanger or cooling unit, or in the spaces of the filtering medium, which may be fibrous, cellulose, paper, cotton, mineral wool, or activated charcoal.

It is seen, therefore, that my invention provides a cigarette with a heat radiating unit which cools the tobacco smoke in advance of filtration, reduces the amount of deposits made in the filter, and delivers to the mouth of the smoker a cleaner and cooler smoke, which increases the pleasure of smoking Having described my invention I claim as new:

1. A cigarette having a supplyof tobacco and a combustible wrapper enclosing said tobacco supply, a filtering medium disposed within a wrapper at one end thereof, and a heat radiating unit disposed between the tobacco supply and the filter and provided with a series of metal tubes forming normally open smoke passages, said tubes being in close relation to the wrapper.

2. A cigarette having a supply of tobacco and an enclosing wrapper and provided with a series of heat exchanger tubes disposed at one end of the tobacco supply and enclosed by said wrapper.

3. A cigarette having a supply of tobacco and a wrapper enclosing said supply, a plurality of heat exchanger tubes disposed at one end of the tobacco supply and in close relation to the wrapper and enclosed thereby, said tubes being open at both ends thereof, and a filtering medium enclosed by the wrapper and disposed at the outer ends of said tubes, whereby tobacco smoke will be cooled in advance of said filter.

4. A cigarette having a supply of smoking tobacco and a paper wrapper enclosing the same, a heat dissipating unit comprising a series of tubes open ended arranged at one end of the tobacco supply and providing normally open smoke passages through which the smoke is drawn in smoking, and a fibrous filtering unit located outwardly of the heat dissipating unit and enclosed by the Wrapper.

5. A cigarette having a supply of smoking tobacco and a wrapper enclosing the same, a ring of metal tubes disposed outwardly of the tobacco supply and located within and against the wrapper and providing passages for the tobacco smoke, and a filter located outwardly of the ring of metal tubes.

6. A cigarette having a supply of smoking tobacco and a wrapper enclosing the same, a smoke cooler comprising a series of rings of metal tubes arranged at one end of the tobacco supply and enclosed by and in contact with the wrapper, and a filtering retainer located outwardly of the tubes and enclosed by said wrapper.

7. A smoking article, comprising a supply of smoking tobacco in aprpoximately cylindrical form equipped on one end thereof with a series longitudinally disposed an nular metal exchanger members fitted within each other and providing tubular passages having intake ends disposed adjacent to theouter end of the tobacco supply and open discharge ends, said members having their inner and outer surfaces in direct communication with the atmosphere to radiate heat exchanged to the same by the passage of smoke from the tobacco supply when ignited and drawn by the smoker, and a filter disposed at the discharge ends of said passages, the tobacco supply, metal heat exchanger and filter being coupled togetherin linear relation to each other. 3 7

References Cited in the file of this patent UNITED STATES PATENTS 1,554,353 Johnson Sept. 22, 1925 1,605,059 Oakes et a1 Sept. 13, 1924 1,983,926 Zimer Dec. 11, 1934 2,185,598 Lackow et a1. Jan. 2, 1940 2,669,995 Troy Feb. 23, 1954 FOREIGN PATENTS 377,147 Great Britain July 21, i932 

1. A CIGARETTE HAVING A SUPPLY OF TOBACCO AND COMBUSTIBLE WRAPPER ENCLOSING SAID TOBACCO SUPPLY, A FILTERING MEDIUM DISPOSED WITHIN A WRAPPER AT ONE END THERETO, AND A HEAT RADIATING UNIT DISPOSED BETWEEN THE TOBACCO SUPPLY AND THE FILER AND PROVIDED WITH A SERIES OF METAL TUBES FORMING NORMALLY OPEN SMOKE PASSAGES, SAID TUBES BEING IN CLOSD RELATION TO THE WRAPPER. 